Le Thi Men, Preston T R  Tran Thi Thao, Bui Van Cong and Dang Ngoc Hoi  2005: On-farm evaluation of the effect of different fertilizers on water spinach (Ipomoea aquatica) yields, and of including water spinach and catfish oil in diets for fattening pigs in the Mekong Delta of Vietnam.   Workshop-seminar "Making better  use of local feed resources" (Editors: Reg Preston and Brian Ogle) MEKARN-CTU, Cantho, 23-25 May, 2005. Article #38. Retrieved, from http://www.mekarn.org/proctu/lemen38.htm